ApsaraDB RDS offers four editions: Basic, High-availability, Cluster, and Enterprise. In addition, the ApsaraDB RDS console provides an portal for you to purchase PolarDB for MySQL clusters. This topic describes how to view the edition of an ApsaraDB RDS instance and provides a comparison between various editions.
For more information about the instance types that are supported by various editions, see Instance families.
View the edition of an RDS instance
Comparison between various editions
|Basic Edition||Your database system consists of only one primary RDS instance, and computing is separated
from storage. This edition is cost-effective.
For more information, see RDS Basic Edition.
|High-availability Edition||Your database system consists of one primary RDS instance and one secondary RDS instance.
These instances work in the high-availability architecture. This edition is suitable
for more than 80% of the actual business scenarios.
For more information, see High-availability Edition.
|Cluster Edition||Your database system consists of one primary RDS instance, one secondary RDS instance,
and up to seven read-only RDS instances. The primary and secondary RDS instances work
in the high availability architecture. The read-only RDS instances are used to increase
the read capability. This edition is developed based on the AlwaysOn technology. It
is supported only for SQL Server. By default, if you select the Cluster Edition, your
database system consists of only one primary RDS instance and one secondary RDS instance.
You can create read-only RDS instances later based on your business requirements.
For more information, see Cluster Edition.
|Production databases for large- and medium-sized enterprises, such as online retailers, automobile companies, and ERP providers|
|Enterprise Edition||Your database system consists of one primary RDS instance and two secondary RDS instances.
Data is synchronously replicated from the primary RDS instance to the secondary RDS
instances. This allows you to ensure data consistency and finance-grade reliability.
For more information, see Enterprise Edition.
|PolarDB for MySQL||PolarDB for MySQL delivers faster scaling, larger storage capacity, and lower replication
For more information, see What is PolarDB?.